Hi all: Based on the comments and discussion for mdev based hardware virtio offloading support[1]. A different approach to support vDPA device is proposed in this series. Instead of leveraging VFIO/mdev which may not work for some vendors. This series tries to introduce a dedicated vDPA bus and leverage vhost for userspace drivers. This help for the devices that are not fit for VFIO and may reduce the conflict when try to propose a bus template for virtual devices in [1]. The vDPA support is split into following parts: 1) vDPA core (bus, device and driver abstraction) 2) virtio vDPA transport for kernel virtio driver to control vDPA device 3) vhost vDPA bus driver for userspace vhost driver to control vDPA device 4) vendor vDPA drivers 5) management API Both 1) and 2) are included in this series. Tiwei will work on part 3). For 4), Ling Shan will work and post IFCVF driver. For 5) we leave it to vendor to implement, but it's better to come into an agreement for management to create/configure/destroy vDPA device. The sample driver is kept but renamed to vdap_sim. An on-chip IOMMU implementation is added to sample device to make it work for both kernel virtio driver and userspace vhost driver. It implements a sysfs based management API, but it can switch to any other (e.g devlink) if necessary. Please refer each patch for more information. Comments are welcomed. [1] https://lkml.org/lkml/2019/11/18/261 Jason Wang (5): vhost: factor out IOTLB vringh: IOTLB support vDPA: introduce vDPA bus virtio: introduce a vDPA based transport vdpasim: vDPA device simulator MAINTAINERS | 2 + drivers/vhost/Kconfig | 7 + drivers/vhost/Kconfig.vringh | 1 + drivers/vhost/Makefile | 2 + drivers/vhost/net.c | 2 +- drivers/vhost/vhost.c | 221 +++------ drivers/vhost/vhost.h | 36 +- drivers/vhost/vhost_iotlb.c | 171 +++++++ drivers/vhost/vringh.c | 434 +++++++++++++++++- drivers/virtio/Kconfig | 15 + drivers/virtio/Makefile | 2 + drivers/virtio/vdpa/Kconfig | 26 ++ drivers/virtio/vdpa/Makefile | 3 + drivers/virtio/vdpa/vdpa.c | 141 ++++++ drivers/virtio/vdpa/vdpa_sim.c | 796 +++++++++++++++++++++++++++++++++ drivers/virtio/virtio_vdpa.c | 400 +++++++++++++++++ include/linux/vdpa.h | 191 ++++++++ include/linux/vhost_iotlb.h | 45 ++ include/linux/vringh.h | 36 ++ 19 files changed, 2327 insertions(+), 204 deletions(-) create mode 100644 drivers/vhost/vhost_iotlb.c create mode 100644 drivers/virtio/vdpa/Kconfig create mode 100644 drivers/virtio/vdpa/Makefile create mode 100644 drivers/virtio/vdpa/vdpa.c create mode 100644 drivers/virtio/vdpa/vdpa_sim.c create mode 100644 drivers/virtio/virtio_vdpa.c create mode 100644 include/linux/vdpa.h create mode 100644 include/linux/vhost_iotlb.h -- 2.19.1
